Comment on the below statement
`TVs` and `OVs` both are found is hcp and simple cube.

Explanation

To comment on the statement "TVs and OVs both are found in hcp and simple cube," we need to analyze the presence of tetrahedral voids (TVs) and octahedral voids (OVs) in different types of crystal structures, specifically the hexagonal close-packed (hcp) structure and the simple cubic structure.

### Step-by-Step Solution:

1. **Understanding Tetrahedral and Octahedral Voids**:
- Tetrahedral voids are formed when four atoms are arranged at the corners of a tetrahedron, with one void located at the center.
- Octahedral voids are formed when six atoms are arranged at the corners of an octahedron, with one void located at the center.

2. **Identifying Closest Packing Structures**:
- Closest packing structures include face-centered cubic (FCC), hexagonal close-packed (hcp), and cubic close-packed (CCP) structures.
- These structures are characterized by efficient packing of atoms, which creates voids.

3. **Tetrahedral and Octahedral Voids in HCP**:
- In the hcp structure, tetrahedral voids are present. Specifically, there are 8 tetrahedral voids per unit cell.
- Additionally, hcp also has octahedral voids, with 4 octahedral voids per unit cell.

4. **Tetrahedral and Octahedral Voids in Simple Cubic**:
- The simple cubic structure does not have tetrahedral voids. It has octahedral voids, but only 1 per unit cell.
- Therefore, the simple cubic structure lacks tetrahedral voids entirely.

5. **Conclusion**:
- The statement claims that both tetrahedral and octahedral voids are found in hcp and simple cubic structures.
- This is incorrect because while hcp contains both types of voids, the simple cubic structure contains only octahedral voids and lacks tetrahedral voids.

### Final Comment:
The statement is **false**. Tetrahedral voids are present in the hcp structure but absent in the simple cubic structure. Only octahedral voids are found in the simple cubic structure.

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